Can someone help to identify this prewar capacitor?
mw21...@gmail.com
paper design, from 1936?
It is rated at 650V and has a 0.25uF capacity (still, just tested).
I have not found out who the manufacturer is - is there a logo
database somewhere to hunt it down?
http://www.box.net/shared/0gl0fuopl0dv54dnf6yh
Have a few and want to get rid of them as I have no need for these.
Thanks for any help or hint!
mw
Phil Allison
<mw21...@gmail.com
** That cap will contain oil as well as paper and foil.
Very likely the dangerous and long outlawed PCB type.
http://en.wikipedia.org/wiki/Polychlorinated_biphenyl
.... Phil
Peter Kunze
from the early GDR (VEB) times. Maybe check with some Robotron-Buffs to
know more about it.
Bye
Peter
hrho...@att.net
agree on the August 1936 dating of the device.
hrho...@att.net
spamtrap1888
mw21...@gmail.com
he4ard of this company.
These caps were most likely installed in German prewar or war
telephones, I found them next to oodles of mic and headset capsules in
the basement, wher my Dad had stashed awy several old bakelite phones,
still in boxes.
Usenet still rocks!
mw
Lup.S
Zwitusch produced also telefonapparatus and cooperated with US
Western electric & Co in a venture in Denmark, Copenhagen:
http://www.erel.de/INH/21/2120100/inh_foto.htm
further Zwitusch logos:
http://www.s-storbeck.de/cms/telefon/apparate_allgemein/hersteller.html
--------------------------------------------------------
0,25 mikro Farad built August 1936
Zwietusch Component Logo
Type/Modell Nr: Ko (means Condenser) ko.20a
Ko. Kondesator Bv = Bau Vorschrift (building regulation?
geprueft mit 650V- (checked with 650V DC)
----------------------------------------------------------
What is labeld at the bottom? I see a number and KV
Condenser with this box type and power class are not containing PCB.
Have fun!
Lup
mw21...@gmail.com
Thanks for all the interesting inputs about this odd device and long-
gone company, never heard of them before, it is soo cool to learn
through Usenet and the internet these days!
Yes, the Ko and Bv abbreviations stand for 'Kondesator' and
Bauvorschrift', this was all before the DIN norms kicked in, hence the
presumed date of 1936 (the number in the upper right).
They may indeed been inside of the famous "W38" bakelite telephone?
Therre may be some among the other boxed phones, have to peek inside
to see.
I will put the caps up on the bay next week, wonder if they have any
importance today (probably not, unlinke tubes)
We live in Germany and had no affiliations with any company, my
father was just a radio/TV technician from the 1940s to 1980s. Due to
some weird coincidences a few odd machines and parts ended up in our
home: eg a funny looking 78rpm Thorens CD50 dual-side record player, a
complete tiny 1951 Protona MD51 wire recorder spy set as used by the
KGB and CIA, old telephones, tape recorders, gauges etc.
In 1954 my Dad even built an entire home entertainment system cabinet
(2m wide, 1.2m high !!), with 5 channel mixer, equalizer, built in
bays for record player, tape recorder, tube amp and tuner, 3 way
speakers, in a heavy macore case. We still operate it today, sounds
still warm and great.
I am slowly emptying the basement out, as all is eventually a burden I
can not really enjoy (for other reasons).
Thanks again for the inputs!
Sylvia Else
His observation may not be right, but it needs to be considered.
Sylvia.
Patrick Turner
> On 14/09/2011 11:11 PM, Phil Allison wrote:
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> - Show quoted text -
Phil can sometimes be upsetting but then he often has the most correct
posts on technical matters, and his statement before about the
capacitors containing deadly toxic PCB oil to help insulate the paper
inside the caps you have could well be correct.
I have several box-fuls of such capacitors which appear to be faily
well sealed metal containers with goodness knows what sort of stuff
inside them, and I've rarely ever used any that I have acquired in job
lots people have donated when they gave me piles of their assorted
junk. I never plan to cut one open to find out what's inside. If I
ever want to use capacitors with high Vdc rating, I will always use
polyester ot polypropylene metal film types which are far more
reliable than anything made with paper, wax, oil, before 1949 when
polyester revolutionised capcitor making.
There may be some thrills to be had when discovering ancient old gear
made in Germany in the 1930s but methinks only a fool would retain the
old capacitors of that era in gear which one might want to actuallly
use for fun.
If the installation of brightly colored modern caps looks bad in some
ancient old radio etc, then how about painting them grey to make 'em
look old? Safety first. One is free to make old looking labels, and
stick them onto such caps.
Patrick Turner
gUnther nanonüm
"Patrick Turner" <in...@turneraudio.com.au> schrieb im Newsbeitrag
news:d2e1e73c-53c0-4be8...@d14g2000yqb.googlegroups.com...
>If the installation of brightly colored modern caps looks bad in some
>ancient old radio etc, then how about painting them grey to make 'em
>look old? Safety first. One is free to make old looking labels, and
>stick them onto such caps.
then send me your gold and silver, in return you will get plastic watches
and a can of golden oven paint...but first go and steal michelangelos works,
we will help the italianos to get some real art in polyesterfoam...
--
mfg,
gUnther
Sylvia Else
Sylvia.
Klaus Butzmann
> Not sure if "Bauvorschrift" is similar to a DIN standard.
"Bauvorschrift" simply means documents,
standard term in production of transformers and similar components.
Butzo